| commit | 9f155b9802bb7049cd0f216c3fe903b58620df11 | |
| author | Chuck Ebbert <76306.1226@compuserve.com> | |
| Fri, 6 Jan 2006 04:11:29 +0000 (5 23:11 -0500) | ||
| committer | Linus Torvalds <torvalds@g5.osdl.org> | |
| Fri, 6 Jan 2006 04:50:51 +0000 (5 20:50 -0800) | ||
| tree | d83fa1699e8113d83588d38a1c16e68cd3fcf462 | treesnapshot (tar.gz zip) |
| parent | 29552b1462799afbe02af035b243e97579d63350 | commitdiff |
[PATCH] i386: PTRACE_POKEUSR: allow changing RF bit in EFLAGS register.
Setting RF (resume flag) allows a debugger to resume execution after a
code breakpoint without tripping the breakpoint again. It is reset by
the CPU after execution of one instruction.
Requested by Stephane Eranian:
"I am trying to the user HW debug registers on i386 and I am running
into a problem with ptrace() not allowing access to EFLAGS_RF for
POKEUSER (see FLAG_MASK). [ ... ] It avoids the need to remove the
breakpoint, single step, and reinstall. The equivalent functionality
exists on IA-64 and is allowed by ptrace()"
Cc: Stephane Eranian <eranian@hpl.hp.com>
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Setting RF (resume flag) allows a debugger to resume execution after a
code breakpoint without tripping the breakpoint again. It is reset by
the CPU after execution of one instruction.
Requested by Stephane Eranian:
"I am trying to the user HW debug registers on i386 and I am running
into a problem with ptrace() not allowing access to EFLAGS_RF for
POKEUSER (see FLAG_MASK). [ ... ] It avoids the need to remove the
breakpoint, single step, and reinstall. The equivalent functionality
exists on IA-64 and is allowed by ptrace()"
Cc: Stephane Eranian <eranian@hpl.hp.com>
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| arch/i386/kernel/ptrace.c | diffblobblamehistory |